The Hylian Shield is a basic metal shield first found in Ocarina of Time, despite it not being the ultimate shield it is however a iconic item that has now come to represent the series on eyesight.
You can get it first as young Link, which isn't the greatest time to use it. His smaller self can't hold the shield very well.
But his future-self can handle it just fine.
I wish the one in Twilight Princess had a bit more vibrant color. A little forgettable.
I didn't know it was a special item in Skyward Sword though. You get it as a special gift from the Thunder Dragon for completing a challenging.